更改 NSTextView 中的文本选择颜色

发布于 2024-10-04 20:49:27 字数 135 浏览 5 评论 0原文

我正在尝试在 NSTextView 上编写“突出显示”功能。目前，一切进展顺利。您选择一个文本范围，该文本的背景颜色将更改为黄色。然而，虽然它仍然处于选中状态，但背景是所选文本的标准蓝色。如何使标准选择指示器颜色在某些情况下不显示？

谢谢！

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自由范儿 2024-10-11 20:49:27

使用 -[NSTextView setSelectedTextAttributes:...]。

例如：

[textView setSelectedTextAttributes:
     [NSDictionary dictionaryWithObjectsAndKeys:
      [NSColor blackColor], NSBackgroundColorAttributeName,
      [NSColor whiteColor], NSForegroundColorAttributeName,
      nil]];

如果您根本不希望以任何方式指示选择（除了隐藏插入点），您可以简单地传递一个空字典。

另一种选择是监视选择更改并使用临时属性。请注意，临时属性用于显示拼写和语法错误并查找结果；因此，如果您关心保留 NSTextView 的这些功能，请确保仅添加和删除临时属性，而不是替换它们。

一个例子是（在 NSTextView 子类中）：

- (void)setSelectedRanges:(NSArray *)ranges affinity:(NSSelectionAffinity)affinity stillSelecting:(BOOL)stillSelectingFlag;
{
    NSArray *oldRanges = [self selectedRanges];
    for (NSValue *v in oldRanges) {
        NSRange oldRange = [v rangeValue];
        if (oldRange.length > 0)
            [[self layoutManager] removeTemporaryAttribute:NSBackgroundColorAttributeName forCharacterRange:oldRange];
    }

    for (NSValue *v in ranges) {
        NSRange range = [v rangeValue];
        if (range.length > 0)
            [[self layoutManager] addTemporaryAttributes:[NSDictionary dictionaryWithObject:[NSColor blueColor] forKey:NSBackgroundColorAttributeName]
                                       forCharacterRange:range];
    }

    [super setSelectedRanges:ranges affinity:affinity stillSelecting:stillSelectingFlag];
}

Use -[NSTextView setSelectedTextAttributes:...].

For example:

[textView setSelectedTextAttributes:
     [NSDictionary dictionaryWithObjectsAndKeys:
      [NSColor blackColor], NSBackgroundColorAttributeName,
      [NSColor whiteColor], NSForegroundColorAttributeName,
      nil]];

You can simply pass an empty dictionary if you don't want the selection indicated in any way at all (short of hiding the insertion point).

Another option is to watch for selection changes and apply the "selection" using temporary attributes. Note that temporary attributes are used to show spelling and grammar mistakes and find results; so if you care about preserving these features of NSTextView then make sure only to add and remove temporary attributes, not replace them.

An example of this is (in a NSTextView subclass):

- (void)setSelectedRanges:(NSArray *)ranges affinity:(NSSelectionAffinity)affinity stillSelecting:(BOOL)stillSelectingFlag;
{
    NSArray *oldRanges = [self selectedRanges];
    for (NSValue *v in oldRanges) {
        NSRange oldRange = [v rangeValue];
        if (oldRange.length > 0)
            [[self layoutManager] removeTemporaryAttribute:NSBackgroundColorAttributeName forCharacterRange:oldRange];
    }

    for (NSValue *v in ranges) {
        NSRange range = [v rangeValue];
        if (range.length > 0)
            [[self layoutManager] addTemporaryAttributes:[NSDictionary dictionaryWithObject:[NSColor blueColor] forKey:NSBackgroundColorAttributeName]
                                       forCharacterRange:range];
    }

    [super setSelectedRanges:ranges affinity:affinity stillSelecting:stillSelectingFlag];
}

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